Yahoo Tuning Groups Ultimate Backup tuning A Galaxcy in a teacup.

A long time ago, I was reading through a book that my mother gave me, and
altho it is back far, far away in the deep recesses of my mind, I have
thought of something that this post on synasthesia brought back to me....

The book itself is called BOILING WATER IN A PAPER CUP, and it had in it a
funny little do-it-your-self project that had the reader design the most
interesting of optical illusions, which consisted of a half white, and half
black paper disk.

There was a further addition to the design of this disk, was that on the
white side of this disk were segments, and these segments had concentric
rings painted on them, concentric rings painted at various distances from
the center.

Each segment has a set of concentric rings at greater and greater distances.....

All of this was pretty novel, but the main point of this illusion was that
you'd spin the disk, and the illusion was created in that you'd see colors.

Colors became most aparent when the disk slowed down, and it was some
phenomonon that tricked the color receptors in the mind's eye into thinikg
that they were perceiveing colors...

I would draw ASCII diagrams to show you this, but I cannot manage circles.

Could a sonic equivalent be created?

I gave this some thought, and I feel that it would be imaginitave to draw
ASCII diagrams after all:

---------------------------
/ \
/ \
/ -------- \
/ -------- \
/ --------------- \
/ //// ------- \
/ //// -------\\\\ \
/ //// \\\\ \
///// \\\\ \
///// ||||| \
///// ||||| \
.---------------------0-------------------------.
\----------------------------------------------/
\--------------------------------------------/
\------------------------------------------/
\----------------------------------------/
\--------------------------------------/
\------------------------------------/
\----------------------------------/
\--------------------------------/
\------------------------------/
-----------------------------

Please let me know if this hexagonal ASCII diagram gets through to you allright.

It is ment to represent a circular disk, with concentric black rings, and a
black bottom half.

You can make this out of card board, and black biro.

be sure to get the balck JET black,a dn the white DAZZELING white.

If you spin this on an electric moror, or a kictchen wizz, you will see
color bands appear as this disk slows down by looking at it from 30cm, or
approximately 11.81 inches.

The outer bands, if memory erves me correctly will appear red, being the
slower of wavelengths, and the inner ones will appear violet.

Yet another variant I can think of on this is one in negative colors, that
is where black=white, and where white=black, or even a four state one, using
quarters where:

A B

C D

A=Negative rings, B=White surface, C=Postivie rings, D=Jet black surface.

I may wounder what the sonic equivalent of this might be???

I assumme that it MIGHT involve the alternation of white noise, and silence
(the sonic equivalent of WHITE and BLACK), and with the white noise having
various frequencys filtered out COMPLETELY.

The alternation of these white//black noise parte could begin really, REALLY
quickly, and then slow down.

Rather than list all of these possibilitys, I would like to see what the
tuning members come up with in ways of experiments, and self-done
home-science-amature projects, and I will compare ideas with you'all.

Any thoughts on the matter?

---Sarn.

Hi Sarn,
the closest sonic equivalent I can think of is Jaque Dudons photosonique disks
[disques ?]. There the idea is an extention of the siren. Normal sirens
basically work by sending a thin stream of air through holes in a spinning
disk. The holes are normally arranged in concentric rings. The greater the
number of holes in a ring and the faster the disk spins the resultant tone will
be higher in pitch. You can have lots of pipes sending streams of air
simaltaneously to different rings. You can play chords this way. The tuning of
the chords will depend on the ratios between the numbers of holes in the rings,
obviously just tunings are very easy to construct, tempered chords would be a
little more challenging [and possibly pointless on such a simple instrument as a
siren].
Jaques Dudon's photosonique disks use clear perspex disks upon which he has
screen printed in black mandala like designs. I believe the spinning of the
dsks is motor controlled. behind the disks he has photovoltaic [solar] cells. He
shines the light torch through the spinning disk [or disks he can use many at
one creating beautiful intereference patterns] on the solar cells. The signal
from the cells is amplified and listened to.

The photosonique disks of Dudon create a similar effect to that you mention [i.e
seeing colour spectrums]

The sound ?
C'est fantastique !

<A Galaxcy in a teacup.